/*
 * yauosk - Yet Another Useless Operating System Kernel
 *
 * Copyright (c) 2009-2010 Matteo Cicuttin
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

// Special assembly routines to access x86-specific
// hardware instructions.

static __inline unsigned char
inb(int port)
{
  unsigned char data;
  __asm __volatile("inb %w1,%0" : "=a" (data) : "d" (port));
  return data;
}

static __inline void
insl(int port, void *addr, int cnt)
{
  __asm __volatile("cld\n\trepne\n\tinsl"     :
                   "=D" (addr), "=c" (cnt)    :
                   "d" (port), "0" (addr), "1" (cnt)  :
                   "memory", "cc");
}

static __inline void
outb(int port, unsigned char data)
{
  __asm __volatile("outb %0,%w1" : : "a" (data), "d" (port));
}

static __inline void
outw(int port, unsigned short data)
{
  __asm __volatile("outw %0,%w1" : : "a" (data), "d" (port));
}

static __inline void
outsl(int port, const void *addr, int cnt)
{
  __asm __volatile("cld\n\trepne\n\toutsl"    :
                   "=S" (addr), "=c" (cnt)    :
                   "d" (port), "0" (addr), "1" (cnt)  :
                   "cc");
}

static __inline void
cli(void)
{
  __asm__ volatile("cli");
}

static __inline void
sti(void)
{
  __asm__ volatile("sti");
}
